[#11877] Improved Agent initialization

[emeroad]

[#noissue] Cleanup PluginTest

[codecov]

Codecov Report

Attention: Patch coverage is 31.20000% with 258 lines in your changes missing coverage. Please review.

Project coverage is 37.25%. Comparing base (f3b008d) to head (3687088).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
.../com/navercorp/pinpoint/profiler/DefaultAgent.java	0.00%	52 Missing ⚠️
...a/com/navercorp/pinpoint/profiler/AgentOption.java	42.42%	19 Missing ⚠️
.../navercorp/pinpoint/bootstrap/PinpointStarter.java	0.00%	17 Missing ⚠️
...pinpoint/bootstrap/config/PropertyLoaderUtils.java	0.00%	17 Missing ⚠️
...npoint/bootstrap/config/ProfilePropertyLoader.java	0.00%	16 Missing ⚠️
.../navercorp/pinpoint/profiler/config/LogConfig.java	0.00%	15 Missing ⚠️
...ercorp/pinpoint/profiler/name/AgentProperties.java	0.00%	14 Missing ⚠️
...t/profiler/test/MockApplicationContextFactory.java	0.00%	13 Missing ⚠️
...ercorp/pinpoint/profiler/test/PluginTestAgent.java	0.00%	13 Missing ⚠️
...ercorp/pinpoint/profiler/name/AgentIdResolver.java	0.00%	11 Missing ⚠️
... and 26 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11899      +/-   ##
============================================
- Coverage     37.37%   37.25%   -0.13%     
+ Complexity    12656    12617      -39     
============================================
  Files          4149     4152       +3     
  Lines        100727   100781      +54     
  Branches      10483    10478       -5     
============================================
- Hits          37651    37547     -104     
- Misses        60037    60201     +164     
+ Partials       3039     3033       -6     

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